Diesel Pre Filter plus Factory Filter

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Originally Posted by mudski

Yes I have a bypass setup on mine with a one way valve in it so if the pump stops fuel can still be drawn through the bypass.

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I've done the same with the Carter 4600. When I mounted the pre-filter, I pulled the pump fuse as a test and it drove correctly albeit with new filters and a freshly rebuilt pump and without making excessive demands on fuel. I just wanted to know I could keep going if the pump failed.

There are pumps that will allow fuel through them if they stop working.